....leaving us some questions:
If that card is really running 588Mhz less, shouldn't the results be worse by far?
Why is max FPS @ windows a lot better?
Why is power consumption in linux 10 watt less? ^^
Why are my results that bad overall? ^^

...and the best question:
If its only a cosmetical bug the the driver reporting to less speed (in both unigine&&nv-control), why is it that hard to fix it?